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freebsd-skq/sys/coda/coda_namecache.h
Tim J. Robbins d14e51c95c Add support for the Coda 6.x venus<->kernel interface. This extends 
FIDs to be 128-bits wide and adds support for realms.

Add a new CODA_COMPAT_5 option, which requests support for the old
Coda 5.x interface instead of the new one.

Create a new coda5.ko module that supports the 5.x interface, and make
the existing coda.ko module use the new 6.x interface. These modules
cannot both be loaded at the same time.

Obtained from:	Jan Harkes & the coda-6.0.2 distribution,
		NetBSD (drochner) (CODA_COMPAT_5 option).
2003-09-07 07:43:10 +00:00

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/*
*
* Coda: an Experimental Distributed File System
* Release 3.1
*
* Copyright (c) 1987-1998 Carnegie Mellon University
* All Rights Reserved
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation, and
* that credit is given to Carnegie Mellon University in all documents
* and publicity pertaining to direct or indirect use of this code or its
* derivatives.
*
* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
* ANY DERIVATIVE WORK.
*
* Carnegie Mellon encourages users of this software to return any
* improvements or extensions that they make, and to grant Carnegie
* Mellon the rights to redistribute these changes without encumbrance.
*
* @(#) src/sys/coda/coda_namecache.h,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
* $FreeBSD$
*
*/
/*
* Mach Operating System
* Copyright (c) 1990 Carnegie-Mellon University
* Copyright (c) 1989 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
* the terms and conditions for use and redistribution.
*/
/*
* This code was written for the Coda filesystem at Carnegie Mellon University.
* Contributers include David Steere, James Kistler, and M. Satyanarayanan.
*/
#ifndef _CODA_NC_HEADER_
#define _CODA_NC_HEADER_
/*
* Coda constants
*/
#define CODA_NC_NAMELEN 15 /* longest name stored in cache */
#define CODA_NC_CACHESIZE 256 /* Default cache size */
#define CODA_NC_HASHSIZE 64 /* Must be multiple of 2 */
/*
* Hash function for the primary hash.
*/
/*
* First try -- (first + last letters + length + (int)cp) mod size
* 2nd try -- same, except dir fid.vnode instead of cp
*/
#ifdef oldhash
#define CODA_NC_HASH(name, namelen, cp) \
((name[0] + name[namelen-1] + namelen + (int)(intptr_t)(cp)) & (coda_nc_hashsize-1))
#else
#define CODA_NC_HASH(name, namelen, cp) \
((name[0] + (name[namelen-1]<<4) + namelen + (((int)(intptr_t)cp)>>8)) & (coda_nc_hashsize-1))
#endif
#define CODA_NAMEMATCH(cp, name, namelen, dcp) \
((namelen == cp->namelen) && (dcp == cp->dcp) && \
(bcmp(cp->name,name,namelen) == 0))
/*
* Functions to modify the hash and lru chains.
* insque and remque assume that the pointers are the first thing
* in the list node, thus the trickery for lru.
*/
#define CODA_NC_HSHINS(elem, pred) insque(elem,pred)
#define CODA_NC_HSHREM(elem) remque(elem)
#define CODA_NC_HSHNUL(elem) (elem)->hash_next = \
(elem)->hash_prev = (elem)
#define CODA_NC_LRUINS(elem, pred) insque(LRU_PART(elem), LRU_PART(pred))
#define CODA_NC_LRUREM(elem) remque(LRU_PART(elem));
#define CODA_NC_LRUGET(lruhead) LRU_TOP((lruhead).lru_prev)
#define CODA_NC_VALID(cncp) (cncp->dcp != (struct cnode *)0)
#define LRU_PART(cncp) (struct coda_cache *) \
((char *)cncp + (2*sizeof(struct coda_cache *)))
#define LRU_TOP(cncp) (struct coda_cache *) \
((char *)cncp - (2*sizeof(struct coda_cache *)))
#define DATA_PART(cncp) (struct coda_cache *) \
((char *)cncp + (4*sizeof(struct coda_cache *)))
#define DATA_SIZE (sizeof(struct coda_cache)-(4*sizeof(struct coda_cache *)))
/*
* Structure for an element in the CODA Name Cache.
* NOTE: I use the position of arguments and their size in the
* implementation of the functions CODA_NC_LRUINS, CODA_NC_LRUREM, and
* DATA_PART.
*/
struct coda_cache {
struct coda_cache *hash_next,*hash_prev; /* Hash list */
struct coda_cache *lru_next, *lru_prev; /* LRU list */
struct cnode *cp; /* vnode of the file */
struct cnode *dcp; /* parent's cnode */
struct ucred *cred; /* user credentials */
char name[CODA_NC_NAMELEN]; /* segment name */
int namelen; /* length of name */
};
struct coda_lru { /* Start of LRU chain */
char *dummy1, *dummy2; /* place holders */
struct coda_cache *lru_next, *lru_prev; /* position of pointers is important */
};
struct coda_hash { /* Start of Hash chain */
struct coda_cache *hash_next, *hash_prev; /* NOTE: chain pointers must be first */
int length; /* used for tuning purposes */
};
/*
* Symbols to aid in debugging the namecache code. Assumes the existence
* of the variable coda_nc_debug, which is defined in cfs_namecache.c
*/
#define CODA_NC_DEBUG(N, STMT) { if (coda_nc_debug & (1 <<N)) { STMT } }
/* Prototypes of functions exported within cfs */
extern void coda_nc_init(void);
extern void coda_nc_enter(struct cnode *, const char *, int, struct ucred *, struct cnode *);
extern struct cnode *coda_nc_lookup(struct cnode *, const char *, int, struct ucred *);
extern void coda_nc_zapParentfid(CodaFid *, enum dc_status);
extern void coda_nc_zapfid(CodaFid *, enum dc_status);
extern void coda_nc_zapvnode(CodaFid *, struct ucred *, enum dc_status);
extern void coda_nc_zapfile(struct cnode *, const char *, int);
extern void coda_nc_purge_user(uid_t, enum dc_status);
extern void coda_nc_flush(enum dc_status);
extern void print_coda_nc(void);
extern void coda_nc_gather_stats(void);
extern int coda_nc_resize(int, int, enum dc_status);
extern void coda_nc_name(struct cnode *cp);
/*
* Structure to contain statistics on the cache usage
*/
struct coda_nc_statistics {
unsigned hits;
unsigned misses;
unsigned enters;
unsigned dbl_enters;
unsigned long_name_enters;
unsigned long_name_lookups;
unsigned long_remove;
unsigned lru_rm;
unsigned zapPfids;
unsigned zapFids;
unsigned zapFile;
unsigned zapUsers;
unsigned Flushes;
unsigned Sum_bucket_len;
unsigned Sum2_bucket_len;
unsigned Max_bucket_len;
unsigned Num_zero_len;
unsigned Search_len;
};
#define CODA_NC_FIND ((u_long) 1)
#define CODA_NC_REMOVE ((u_long) 2)
#define CODA_NC_INIT ((u_long) 3)
#define CODA_NC_ENTER ((u_long) 4)
#define CODA_NC_LOOKUP ((u_long) 5)
#define CODA_NC_ZAPPFID ((u_long) 6)
#define CODA_NC_ZAPFID ((u_long) 7)
#define CODA_NC_ZAPVNODE ((u_long) 8)
#define CODA_NC_ZAPFILE ((u_long) 9)
#define CODA_NC_PURGEUSER ((u_long) 10)
#define CODA_NC_FLUSH ((u_long) 11)
#define CODA_NC_PRINTCODA_NC ((u_long) 12)
#define CODA_NC_PRINTSTATS ((u_long) 13)
#endif
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